Lovecraft's Ghostwriting

Howard Philips Lovecraft is largely known for authoring such classic works as The Shadow Out of Time. He is less known for horror stories he had a hand in, through his revisions and collaborations with other authors.

In many cases, the product of Lovecraft's ghostwriting achieved little success.

However, some of his collaborations merit our attention. That part of Lovecraft's work falls under one of two headings. I'm borrowing primarily from The Horror in the Museum, 2007. In one case, Lovecraft re-wrote so much of the story, that aside from the original author's name, it was a HPL work. In the second set of stories, Lovecraft acted more as a regular editor: he corrected language, syntax, and punctuation. What I want to do is to provide two lists from the aforementioned reference.